Enterprise SOA Experience Workshop. Module 8: Operating an enterprise SOA Landscape

Transcription

1 Enterprise SOA Experience Workshop Module 8: Operating an enterprise SOA Landscape

2 Agenda 1. Authentication and Authorization 2. Web Services and Security 3. Web Services and Change Management 4. Summary SAP 2008 / Page 2

3 Business Roles and Privileges Business Roles Represent the business tasks of an employee Are usually defined as part of a business process Can be set up in hierarchies Are a combination of privileges and/or other business roles Are usually assigned to end users Business Roles Manager Accounting User User Privileges Represent the access information or technical authorizations (like ABAP authorization roles, UME roles, Portal roles, AD groups, ) External Service User Privileges AD-User End user (Portal Role) Accounting (ABAP Role) Manager (ABAP Role) Are system specific can span internal and external systems Employer outsourced Service (e.g. Travel Service) System Active Directory SAP NetWeaver Portal SAP FI SAP HR Corporate Systems SAP 2008 / Page 3

4 Role Definition and Provisioning Role Definition (design, 1-time) Read system access information (roles, groups, authorizations, ) from target systems Define a business role hierarchy Assign technical roles to business roles Develop rules for role assignments Provisioning (regularly) Assign or remove roles to/from people manually through Workflow or automatically, e.g. HR-driven/event-driven Automatic adjustment of master data and assignments of technical authorizations in target systems Connectors: ABAP (BAPI from 4.6c onwards) Java (SPML from SAP NetWeaver 04 onwards) Non SAP (MS ADS, LDAP, and others) Connector API in Java SAP NetWeaver Identity Management Password Management Identity Virtualization Roles and Assignments Provisioning Reporting Data Synchronization SAP 2008 / Page 4

5 Service Consumer Application Service Provider Application Enterprise Services Authentication and Single Sign-On Authentication can occur with solutions that are available with: the transport (HTTP protocol) the message (SOAP protocol) Message level mechanisms build on transport level authentication levels not mutually exclusive Authentication solutions supported by SAP NetWeaver: Service Message Level WSS Username Token Profiles WSS X.509 Certificate Token Profiles WSS SAML Token Profiles* Service Transport Level User ID and Password X.509 Client Certificates Logon Tickets SAP 2008 / Page 5 *support with SAP NetWeaver CE and PI 7.1. Down ported to SAP NetWeaver AS ABAP 7.0 SP14 and higher

6 Security Assertion Markup Language (SAML) SAML is an established OASIS standard to provide open, standard-based and interoperable Single Sign-On in heterogeneous landscapes SAML is a security protocol for Encoding authentication (and authorization) information in XML Assertions Verifying authentication against a SAML assertion authority source site Exchanging authentication information in a request/response fashion SAML provides Single Sign-On after an initial authentication Comparable to SAP Logon Tickets but not cookie based For secure message exchange SAML uses standard security protocols like SSL, TLS and XML signatures Support for SAML is strategic within SAP and will be continuously enhanced SAP 2008 / Page 6

7 Benefits of Security Assertions Markup Language (SAML) Interoperable security solution to allow systems integration with great ease and minimal resources SAML is a protocol for encoding security related information (assertions) into XML and exchanging this information in a request/response fashion Provides standard based mechanisms to exchange security information using SOAP, HTTP(s) SAML is an OASIS standard Domain Boundary SAML SAP Logon Ticket SAP 2008 / Page 7

8 Securing Single Sign On with SAML Assertions SAML authorities produce assertions in response to client requests. An assertion can consist of Authentication Statement: piece of data that represents an act of authentication performed on a subject (user) by the authority Authorization Statement Attribute Statement SAML Assertion Authentication Statement Other Statements SAP 2008 / Page 8

9 SAML Based Single Sign-On Scenarios SAML Identity Provider SAML Service Provider Web Browser based SSO SAML Browser/Artifact Profile SAML Standard Web Service based SSO SAML Token Profile Web Service Security Standard Service Consumer SAP 2008 / Page 9

10 SAML Token Profiles: Sender Vouches Subject Scenario Underlies Principal Propagation with Process Integration 7.1 How it works: client application Service call through Logical Port Service Provider Application Service Consumer SAML Identity Provider Service Provider Enables access to provider-side resources via consumer side user context in message in an interoperable way User access to service verified by consumer system with a SAML assertion SAP 2008 / Page 10

11 Secure Propagation of User Identity Goal Enforce user-based access control for distributed application processes Audit user access in service provider backend Securely pass the identity of a user in a system-to-system service call Service Client Service Provider HTTP SOAP over HTTP Bob User Authentication/SSO to Portal Web application User Identity Propagation for Web Service Call Solutions supporting secure Service Client to Service Provider identity propagation: SAP service consumers: Heterogeneous system landscapes: Bob Logon Tickets WSS SAML Token Profiles SAP 2008 / Page 11

12 Agenda 1. Authentication and Authorization Identity Management 2. Web Services and Security 3. Web Services and Change Management 4. Summary SAP 2007 / Page 12

13 WS-Security Motivation The SOAP protocol on its own does not provide any security mechanisms for Message Integrity & Confidentiality Authentication Non Repudiation of origin or receipt But: SOAP can be extended to provide additional features Up to the year 2002, best practice was to secure Web Services using Secure Sockets Layer (SSL) SOAP Envelope SOAP Header SOAP Body Data SOAP message format But SSL provides transport not application-level security SOAP Messages secured point-to-point, not end-to-end Messages stored unencrypted in files or databases at intermediaries not independent of underlying transport protocol WS-Security submitted to standards body (OASIS) in Sept 2002 and approved as an OASIS Standard in April 2004 SAP 2007 / Page 13

14 WS-Security in SAP NetWeaver Core Concepts Security Templates describe the security (i.e. Signature) used to protect the message (What will be protected). They define common security best practice scenarios Security Profiles define the runtime configuration of a Service or Consumer (Proxy) based on a Security Template (How will the message be protected) One profile may be assigned to multiple operations - that is, when the same certificate is to be used for an XML Signature, or different profiles of the same template are used for operations with different XML Signatures Service Consumer SOAP Request Service Provider operation() Outbound Inbound Inbound Outbound operation() Inbound/Outbound Security Profile based on a Security Template SOAP Response SAP 2008 / Page 14

15 WS Security in SAP NetWeaver Extended message level security options for Web Services Message authentication Username token profiles X.509 certificate token profiles SAML token profiles Message guarantees XML signatures XML encryption Web Service Reliable Messaging Message security configuration WS Security Policy WS Trust SOAP Envelope SOAP Header WS-Security Header SOAP Body Data Security Token Timestamp Signature Encrypted Key + Data SAP 2008 / Page 15

16 Point to Point Service Consumption Simplified Example System security Service destination to provider Exchange system certificates with provider Setup transport security (SSL) - optional Application security Define web access authentication configuration (in ticket policy configuration) Authorization check with UME Service security Acquired fromon WS Security Policy definitions in WSDL Create new LP must sync with SEI System security Exchange system certificates with Consumer Setup Service User / User Mapping (ABAP / Portal) Setup secure communication (SSL) - optional Application security Role based authorization check Service security Authentication requirements in SEI Service guarantees in SEI Confidentiality (SSL / XML enc) Integrity (XML Sign) WS-Reliable Messaging and fault reports Secure Conversation (with SSL for bootstrap) Setup service call via proxy Consumer CONSUMER APPLICATION tad LOGICAL PORT DIRECT CONNECTION SERVICE ENDPOINT Provider SERVICE IMPLEMENTATION Bob Service User / Bob SAP 2008 / Page 16

17 Mediated consumption via Process Integration 7.1 Service call through Process Integration provides for value added services Single point for service provisioning from various providers Service Routing, BPM and Mapping Connectivity to backend systems Asynchronous service capabilities XML schema validation for protecting message contents against misuse Security options for letting user Bob access to provider: Direct Access: User ID/Password (service user based) X.509 Certificate (service user based) SAML Tokens (propagate end user) Logon Ticket (propagate end user) Refined access control for brokered access Principal Propagation via PI: SAML Token Profile (message) Logon Tickets (transport) Consumer CONSUMER APPLICATION tbd LOGICAL PORT Bob SERVICE ENDPOINT Process Integration ROUTING MAPPING BPM SERVICE ENDPOINT INTERFACE ADAPTER Provider Provider SERVICE IMPLEMENTATION SERVICE IMPLEMENTATION Service User / Bob SAP 2008 / Page 17

18 Security Administration in SAP NetWeaver Administrator Efficient management of security through integrated interface accessible from a Web browser Centralized and web based administration of security functionality through integration in SAP NetWeaver Administrator Key Storage, Virus Scan, Destinations, Authentication Trusted Systems SSO2 Logon Ticket Configuration Wizard SAML Browser Artifact SAML Token Profiles Identity Management (User Management Engine user interface) Web Service Security configuration management Mass Administration for service provisioning Remote logging and monitoring administration with Computer Center Management System Functionality for landscape-based security management with System Landscape Directory functions (continuously enhanced) SAP 2008 / Page 18

19 SAP NetWeaver Administrator Mass Service Provider Administration Consumer System Destination Service User Mech. = Service User in message Ticket Single Sign On Mech. = SAML Account Service User Account Ticket Logon Provider System Consumer Group Employee Services : LeaveRequestOverviewService ChangeBankDataService Two runtime configurations on provider and consumer side: Profile/Domain Supported Authentication Mechanisms SAML (always possible) Assertion Ticket Username/Password in message Provider Side Consumable via HTTPS Supported Authentication Mechanisms: SAML, Assertion Ticket, Username/Password in message Consumer Side Uses HTTPS LeaveRequestOverViewService uses service user authentication (Account s Service User) ChangeBankDataService uses SAML authentication SAP 2008 / Page 19

20 Agenda 1. Authentication and Authorization Identity Management 2. Web Services and Security 3. Web Services and Change Management 4. Summary SAP 2007 / Page 20

21 Web Service Change Management and Interoperability Types of interaction with a Services Registry Publish/Unpublish/Update (service provider service registry) Find/Browse/Discover (service consumer/requester service registry) Invoke/Bind (service consumer/requester service provider) Challenges A WebService is typically consumed by multiple consumer Web service that has been running for a while it will most likely change in some regard (e.g. security configuration, bug fixes, or others) Solution Approach for UDDI 3.x with Subscriptions: UDDI version 3 provides the Subscription API Set, which is a mechanism that allows Web service consumers to subscribe to certain search criteria or directly to certain UDDI entities in order to get informed about changes in the registry. SAP 2008 / Page 22

22 UDDI Notification Mechanisms Synchronous change tracking Asynchronous notifications SAP 2008 / Page 23

23 Agenda 1. Authentication and Authorization Identity Management 2. Web Services and Security 3. Web Services and Change Management 4. Summary SAP 2007 / Page 24

24 SAP NetWeaver Platform Based Security Solutions: Integrated infrastructural services for meet requirements of diverse enterprise environments REQUIREMENT SAP NETWEAVER Empower business users Delegated user and content administration with centralized Identity Management for landscapes Support for flexible service and user authentication and SSO solutions Simplify administration and ensure business continuity with lower TCO Integrated security administration in Web-based NetWeaver Administrator SAP NetWeaver Identity Management Standards-based security solutions Native support for interoperable and flexible security solutions based on open standards JAAS SAML SPML GSS API WS-Security WS-Secure Conversation WS-Policy and WS-SecurityPolicy WS-Reliable Messaging Security Solutions for Enterprise Service Oriented Architectures and Process Integration Infrastructure-based protection of SAP NetWeaver applications against common attacks WS-Security, WS Security Extensions* SAML Browser Artifacts and WSS SAML Token Profiles Service Repository and Composites Security Access control and secure key management Virus Scanning interface, Output Encoding, Blacklist filtering, XML Schema Validation with PI 7.1 *support for XML Signatures, Username and Certificate token Certificates. Full support for XML Encryption and SAML Token Profiles with SAP NetWeaver 7.10, down port to SAP NetWeaver 7.0 AS ABAP SP 14 and higher SAP 2008 / Page 25